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86 300E/ 88 300TE
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53 Posts
Discussion Starter #1
This thing. New head so been sitting. Back together and fuel pressure now all draining back to tank... goes up to 80+ then immediately drops back to 25lbs. I just replaced the check valves and have the accumulator clamped off. I have good space between the FD plunger and arm, what are the possible issues here? I guess I could have FD issues tho it's a calibrated and rebuilt unit (not cheapo), and it's conceivable that one of the new ebay check valves is bad outa box... anything else that could cause this problem? Any way to manually check these valves to rule them out? Really flustered here... thanks for any ideas (89 M103 wagon).
 

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86 300E/ 88 300TE
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53 Posts
Discussion Starter #3
tuttlebenne, yes. Someone told me to cycle pumps with air flap wide open and look for puddle in the airflow body.
 

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Premium Member
'92 300TE 4matic 280,000miles, '92 300TE 4Matic 'Ice Blue Metalic' 101,000miles
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10,246 Posts
Even tho it's pinched off (rubber line)? thanks
Missed that in the description. You only clamp it off to test it...unclamp it if it passed the test. Not sure why you still have it clamped off?

Kevin
 

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Registered
86 300E/ 88 300TE
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53 Posts
Discussion Starter #9
Solved. Somehow, a good used FD did the trick. All good but have some weird popping issues at high rpm. Mixture spot on, every other dang thing is new, might start a new thread.
 

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1989 W124 260E
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1,270 Posts
What condition are your electrics in .Like distributor leads rotor arm and your plugs .. To answer this -did it run well before fd replacment ?. Tak a look at it running in the dark for tell tail signs of blueish flashes.
 

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86 300E/ 88 300TE
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53 Posts
Discussion Starter #11 (Edited)
plinker17722
Solved my issue but check it out, might be interesting to the perversely inclined. Recap; I had installed a chilled cam/rockers which came without cam/rotor bracket. Not wanting to mess around with playing parts detective, I just had the local Merc dealer get me the "correct" (HA!) one + the bolt. But when i installed it it wouldn't run for love or money (also complicated by a messed up FD). So, being the curious sort, I checked out where rotor was pointing at TDC 1 and it was off by two positions. So, genius that I obviously am (HA!) I rotated the whole shebang two positions clockwise to correspond and it fired right off. Turns out though, it was very close to being correct but it was off enough to cause problems at high rpm. So, on one of these forums yes, somone said that 1031580840 was correct bracket for the chilled cam so, I found one locally but it was a URO part *cough and when I tried to stuff it in the cam it was 2/10 of a mm too fat. But see, timing position looked just right so... steaming mad went down to local machine shop and had him turn it down to match the hole, installed it, shifted the wires back to stock position and the thing runs perfectly, no spitting even if I abuse it. So, I still don't know what the heck Mercedes sold me and neither do they (neither one of us keep records) and... I don't know if the forum poster got his part # mixed up and what I really need is the 74433024001 (which supposed fit the old style cam) or, if URO put 001 in an 840 package. Want to get the right OE part in there, maybe someone can decipher what happened. Least it's running great now... thanks. Am I banned now? ;)
 
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